John Ternus has taken over as Apple's chief executive officer, succeeding Tim Cook after a 15-year leadership period. Ternus, who assumed the role on Tuesday, previously served as senior vice president for hardware engineering since 2021. He joined Apple's product design team in 2001 and rose through the ranks, overseeing launches of major product lines like the iPad and AirPods. The transition was announced in April, with Cook moving to executive chairman.